4 Questions on Introduction to Computer Architecture - Homework 4 | CPSC 5155G, Assignments of Computer Architecture and Organization

Download 4 Questions on Introduction to Computer Architecture - Homework 4 | CPSC 5155G and more Assignments Computer Architecture and Organization in PDF only on Docsity! CPSC 5155 Introduction to Computer Architecture Homework Assignment 4 Due Wednesday, November 8, 2006 REMEMBER: PUT NO ANSWERS ON THIS SHEET. 1. A cache memory with access time of 10 nanoseconds is connected to a main memory with access time 50 nanoseconds. What is the effective access time if a) the hit ratio is 0.999 (99.9%) b) the hit ratio is 0.98 (98%)? 2. This question concerns a cache memory setup – a cache memory fronting for a main memory. The primary memory (cache memory) has an access time of 6 nsec. When the cache runs with a 99% hit rate, the combination has an effective access time of 6.54 nsec. What is the access time of the secondary memory (main memory)? 3. Suppose a computer using direct mapped cache has 232 words of main memory and a cache of 1024 blocks, where each cache block contains 32 words. a) How many blocks of main memory are there? b) What is the format of a memory address as seen by the cache, that is, what are the sizes of the tag, block, and word fields? c) To which cache block will the memory reference 0000 63FA map? 4. Suppose a computer using fully associative cache has 224 words of main memory and a cache of 128 blocks, where each cache block contains 64 words. a) How many blocks of main memory are there? b) What is the format of a memory address as seen by the cache, that is, what are the sizes of the tag and word fields?